Too small, too much load. Did it used to work, or has it always overheated? Did something bind, was it overloaded?
Low voltage. Too far from the transformer, too small wire. Motor wired wrong, wrong voltage, wrong wire connection combinations.
If it is a 3 phase motor, and it lost a phase, it will overheat, but there should have been overload protection on the starter. If the starter is factory, that could be a clue to what size the motor is by the overload heaters, IF they are correct. That needs to be corrected if it's not working or the wrong heaters.
Packed with debris, motors need air circulation, if it was clogged it would have overheated.
I doubt it is good if the varnish melted, but nothing to loose by trying.
A call to the manufacturer might give you a motor size.
Things to check when ordering a motor:
Frame size. You can take measurements from the original motor, look up a NEMA frame chart, find out what the dimensions are.
Horse power. You can go up but not down.
RPM. Need to be close to the original, probably 1750.
Single or 3 phase.
Enclosure. It needs to be TEFC (totally enclosed fan cooled). Sounds like a dirty job, you want it enclosed.
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